[Bug target/114829] New: No fcsel produced for f16

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114829

            Bug ID: 114829
           Summary: No fcsel produced for f16
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:
```
void
foo (int a, _Float16 b1, _Float16 b2, _Float16 *b)
{
  *b = a ? b1 : b2;
}

```

This should produce:
```
foo:
        cmp     w0, #0
        fcsel   h0, h1, h0, eq
        str     h0, [x1]
        ret
```

Or :
```
foo:
        cmp     w0, #0
        fcsel   s0, s1, s0, eq
        str     h0, [x1]
        ret
```

Depending on if we have fp16 enabled or not.

Right now GCC produces branches instead.

Noticed while working on PR 98477 since *cmov<mode>_insn pattern uses GPF
iterator and not GPF_F16.